err.no Git - linux-2.6/blob - drivers/acpi/executer/exregion.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exregion - ACPI default op_region (address space) handlers
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2007, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acinterp.h>
  47
  48 #define _COMPONENT          ACPI_EXECUTER
  49 ACPI_MODULE_NAME("exregion")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_ex_system_memory_space_handler
  54  *
  55  * PARAMETERS:  Function            - Read or Write operation
  56  *              Address             - Where in the space to read or write
  57  *              bit_width           - Field width in bits (8, 16, or 32)
  58  *              Value               - Pointer to in or out value
  59  *              handler_context     - Pointer to Handler's context
  60  *              region_context      - Pointer to context specific to the
  61  *                                    accessed region
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Handler for the System Memory address space (Op Region)
  66  *
  67  ******************************************************************************/
  68 acpi_status
  69 acpi_ex_system_memory_space_handler(u32 function,
  70                                     acpi_physical_address address,
  71                                     u32 bit_width,
  72                                     acpi_integer * value,
  73                                     void *handler_context, void *region_context)
  74 {
  75         acpi_status status = AE_OK;
  76         void *logical_addr_ptr = NULL;
  77         struct acpi_mem_space_context *mem_info = region_context;
  78         u32 length;
  79         acpi_size window_size;
  80 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
  81         u32 remainder;
  82 #endif
  83
  84         ACPI_FUNCTION_TRACE(ex_system_memory_space_handler);
  85
  86         /* Validate and translate the bit width */
  87
  88         switch (bit_width) {
  89         case 8:
  90                 length = 1;
  91                 break;
  92
  93         case 16:
  94                 length = 2;
  95                 break;
  96
  97         case 32:
  98                 length = 4;
  99                 break;
 100
 101         case 64:
 102                 length = 8;
 103                 break;
 104
 105         default:
 106                 ACPI_ERROR((AE_INFO, "Invalid SystemMemory width %d",
 107                             bit_width));
 108                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 109         }
 110
 111 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
 112         /*
 113          * Hardware does not support non-aligned data transfers, we must verify
 114          * the request.
 115          */
 116         (void)acpi_ut_short_divide((acpi_integer) address, length, NULL,
 117                                    &remainder);
 118         if (remainder != 0) {
 119                 return_ACPI_STATUS(AE_AML_ALIGNMENT);
 120         }
 121 #endif
 122
 123         /*
 124          * Does the request fit into the cached memory mapping?
 125          * Is 1) Address below the current mapping? OR
 126          *    2) Address beyond the current mapping?
 127          */
 128         if ((address < mem_info->mapped_physical_address) ||
 129             (((acpi_integer) address + length) > ((acpi_integer)
 130                                                   mem_info->
 131                                                   mapped_physical_address +
 132                                                   mem_info->mapped_length))) {
 133                 /*
 134                  * The request cannot be resolved by the current memory mapping;
 135                  * Delete the existing mapping and create a new one.
 136                  */
 137                 if (mem_info->mapped_length) {
 138
 139                         /* Valid mapping, delete it */
 140
 141                         acpi_os_unmap_memory(mem_info->mapped_logical_address,
 142                                              mem_info->mapped_length);
 143                 }
 144
 145                 /*
 146                  * Don't attempt to map memory beyond the end of the region, and
 147                  * constrain the maximum mapping size to something reasonable.
 148                  */
 149                 window_size = (acpi_size)
 150                     ((mem_info->address + mem_info->length) - address);
 151
 152                 if (window_size > ACPI_SYSMEM_REGION_WINDOW_SIZE) {
 153                         window_size = ACPI_SYSMEM_REGION_WINDOW_SIZE;
 154                 }
 155
 156                 /* Create a new mapping starting at the address given */
 157
 158                 mem_info->mapped_logical_address =
 159                     acpi_os_map_memory((acpi_native_uint) address, window_size);
 160                 if (!mem_info->mapped_logical_address) {
 161                         ACPI_ERROR((AE_INFO,
 162                                     "Could not map memory at %8.8X%8.8X, size %X",
 163                                     ACPI_FORMAT_UINT64(address),
 164                                     (u32) window_size));
 165                         mem_info->mapped_length = 0;
 166                         return_ACPI_STATUS(AE_NO_MEMORY);
 167                 }
 168
 169                 /* Save the physical address and mapping size */
 170
 171                 mem_info->mapped_physical_address = address;
 172                 mem_info->mapped_length = window_size;
 173         }
 174
 175         /*
 176          * Generate a logical pointer corresponding to the address we want to
 177          * access
 178          */
 179         logical_addr_ptr = mem_info->mapped_logical_address +
 180             ((acpi_integer) address -
 181              (acpi_integer) mem_info->mapped_physical_address);
 182
 183         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 184                           "System-Memory (width %d) R/W %d Address=%8.8X%8.8X\n",
 185                           bit_width, function, ACPI_FORMAT_UINT64(address)));
 186
 187         /*
 188          * Perform the memory read or write
 189          *
 190          * Note: For machines that do not support non-aligned transfers, the target
 191          * address was checked for alignment above.  We do not attempt to break the
 192          * transfer up into smaller (byte-size) chunks because the AML specifically
 193          * asked for a transfer width that the hardware may require.
 194          */
 195         switch (function) {
 196         case ACPI_READ:
 197
 198                 *value = 0;
 199                 switch (bit_width) {
 200                 case 8:
 201                         *value = (acpi_integer) ACPI_GET8(logical_addr_ptr);
 202                         break;
 203
 204                 case 16:
 205                         *value = (acpi_integer) ACPI_GET16(logical_addr_ptr);
 206                         break;
 207
 208                 case 32:
 209                         *value = (acpi_integer) ACPI_GET32(logical_addr_ptr);
 210                         break;
 211
 212                 case 64:
 213                         *value = (acpi_integer) ACPI_GET64(logical_addr_ptr);
 214                         break;
 215
 216                 default:
 217                         /* bit_width was already validated */
 218                         break;
 219                 }
 220                 break;
 221
 222         case ACPI_WRITE:
 223
 224                 switch (bit_width) {
 225                 case 8:
 226                         ACPI_SET8(logical_addr_ptr) = (u8) * value;
 227                         break;
 228
 229                 case 16:
 230                         ACPI_SET16(logical_addr_ptr) = (u16) * value;
 231                         break;
 232
 233                 case 32:
 234                         ACPI_SET32(logical_addr_ptr) = (u32) * value;
 235                         break;
 236
 237                 case 64:
 238                         ACPI_SET64(logical_addr_ptr) = (u64) * value;
 239                         break;
 240
 241                 default:
 242                         /* bit_width was already validated */
 243                         break;
 244                 }
 245                 break;
 246
 247         default:
 248                 status = AE_BAD_PARAMETER;
 249                 break;
 250         }
 251
 252         return_ACPI_STATUS(status);
 253 }
 254
 255 /*******************************************************************************
 256  *
 257  * FUNCTION:    acpi_ex_system_io_space_handler
 258  *
 259  * PARAMETERS:  Function            - Read or Write operation
 260  *              Address             - Where in the space to read or write
 261  *              bit_width           - Field width in bits (8, 16, or 32)
 262  *              Value               - Pointer to in or out value
 263  *              handler_context     - Pointer to Handler's context
 264  *              region_context      - Pointer to context specific to the
 265  *                                    accessed region
 266  *
 267  * RETURN:      Status
 268  *
 269  * DESCRIPTION: Handler for the System IO address space (Op Region)
 270  *
 271  ******************************************************************************/
 272
 273 acpi_status
 274 acpi_ex_system_io_space_handler(u32 function,
 275                                 acpi_physical_address address,
 276                                 u32 bit_width,
 277                                 acpi_integer * value,
 278                                 void *handler_context, void *region_context)
 279 {
 280         acpi_status status = AE_OK;
 281         u32 value32;
 282
 283         ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
 284
 285         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 286                           "System-IO (width %d) R/W %d Address=%8.8X%8.8X\n",
 287                           bit_width, function, ACPI_FORMAT_UINT64(address)));
 288
 289         /* Decode the function parameter */
 290
 291         switch (function) {
 292         case ACPI_READ:
 293
 294                 status = acpi_os_read_port((acpi_io_address) address,
 295                                            &value32, bit_width);
 296                 *value = value32;
 297                 break;
 298
 299         case ACPI_WRITE:
 300
 301                 status = acpi_os_write_port((acpi_io_address) address,
 302                                             (u32) * value, bit_width);
 303                 break;
 304
 305         default:
 306                 status = AE_BAD_PARAMETER;
 307                 break;
 308         }
 309
 310         return_ACPI_STATUS(status);
 311 }
 312
 313 /*******************************************************************************
 314  *
 315  * FUNCTION:    acpi_ex_pci_config_space_handler
 316  *
 317  * PARAMETERS:  Function            - Read or Write operation
 318  *              Address             - Where in the space to read or write
 319  *              bit_width           - Field width in bits (8, 16, or 32)
 320  *              Value               - Pointer to in or out value
 321  *              handler_context     - Pointer to Handler's context
 322  *              region_context      - Pointer to context specific to the
 323  *                                    accessed region
 324  *
 325  * RETURN:      Status
 326  *
 327  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
 328  *
 329  ******************************************************************************/
 330
 331 acpi_status
 332 acpi_ex_pci_config_space_handler(u32 function,
 333                                  acpi_physical_address address,
 334                                  u32 bit_width,
 335                                  acpi_integer * value,
 336                                  void *handler_context, void *region_context)
 337 {
 338         acpi_status status = AE_OK;
 339         struct acpi_pci_id *pci_id;
 340         u16 pci_register;
 341         u32 value32;
 342
 343         ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
 344
 345         /*
 346          *  The arguments to acpi_os(Read|Write)pci_configuration are:
 347          *
 348          *  pci_segment is the PCI bus segment range 0-31
 349          *  pci_bus     is the PCI bus number range 0-255
 350          *  pci_device  is the PCI device number range 0-31
 351          *  pci_function is the PCI device function number
 352          *  pci_register is the Config space register range 0-255 bytes
 353          *
 354          *  Value - input value for write, output address for read
 355          *
 356          */
 357         pci_id = (struct acpi_pci_id *)region_context;
 358         pci_register = (u16) (u32) address;
 359
 360         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 361                           "Pci-Config %d (%d) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
 362                           function, bit_width, pci_id->segment, pci_id->bus,
 363                           pci_id->device, pci_id->function, pci_register));
 364
 365         switch (function) {
 366         case ACPI_READ:
 367
 368                 status = acpi_os_read_pci_configuration(pci_id, pci_register,
 369                                                         &value32, bit_width);
 370                 *value = value32;
 371                 break;
 372
 373         case ACPI_WRITE:
 374
 375                 status = acpi_os_write_pci_configuration(pci_id, pci_register,
 376                                                          *value, bit_width);
 377                 break;
 378
 379         default:
 380
 381                 status = AE_BAD_PARAMETER;
 382                 break;
 383         }
 384
 385         return_ACPI_STATUS(status);
 386 }
 387
 388 /*******************************************************************************
 389  *
 390  * FUNCTION:    acpi_ex_cmos_space_handler
 391  *
 392  * PARAMETERS:  Function            - Read or Write operation
 393  *              Address             - Where in the space to read or write
 394  *              bit_width           - Field width in bits (8, 16, or 32)
 395  *              Value               - Pointer to in or out value
 396  *              handler_context     - Pointer to Handler's context
 397  *              region_context      - Pointer to context specific to the
 398  *                                    accessed region
 399  *
 400  * RETURN:      Status
 401  *
 402  * DESCRIPTION: Handler for the CMOS address space (Op Region)
 403  *
 404  ******************************************************************************/
 405
 406 acpi_status
 407 acpi_ex_cmos_space_handler(u32 function,
 408                            acpi_physical_address address,
 409                            u32 bit_width,
 410                            acpi_integer * value,
 411                            void *handler_context, void *region_context)
 412 {
 413         acpi_status status = AE_OK;
 414
 415         ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
 416
 417         return_ACPI_STATUS(status);
 418 }
 419
 420 /*******************************************************************************
 421  *
 422  * FUNCTION:    acpi_ex_pci_bar_space_handler
 423  *
 424  * PARAMETERS:  Function            - Read or Write operation
 425  *              Address             - Where in the space to read or write
 426  *              bit_width           - Field width in bits (8, 16, or 32)
 427  *              Value               - Pointer to in or out value
 428  *              handler_context     - Pointer to Handler's context
 429  *              region_context      - Pointer to context specific to the
 430  *                                    accessed region
 431  *
 432  * RETURN:      Status
 433  *
 434  * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
 435  *
 436  ******************************************************************************/
 437
 438 acpi_status
 439 acpi_ex_pci_bar_space_handler(u32 function,
 440                               acpi_physical_address address,
 441                               u32 bit_width,
 442                               acpi_integer * value,
 443                               void *handler_context, void *region_context)
 444 {
 445         acpi_status status = AE_OK;
 446
 447         ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
 448
 449         return_ACPI_STATUS(status);
 450 }
 451
 452 /*******************************************************************************
 453  *
 454  * FUNCTION:    acpi_ex_data_table_space_handler
 455  *
 456  * PARAMETERS:  Function            - Read or Write operation
 457  *              Address             - Where in the space to read or write
 458  *              bit_width           - Field width in bits (8, 16, or 32)
 459  *              Value               - Pointer to in or out value
 460  *              handler_context     - Pointer to Handler's context
 461  *              region_context      - Pointer to context specific to the
 462  *                                    accessed region
 463  *
 464  * RETURN:      Status
 465  *
 466  * DESCRIPTION: Handler for the Data Table address space (Op Region)
 467  *
 468  ******************************************************************************/
 469
 470 acpi_status
 471 acpi_ex_data_table_space_handler(u32 function,
 472                                  acpi_physical_address address,
 473                                  u32 bit_width,
 474                                  acpi_integer * value,
 475                                  void *handler_context, void *region_context)
 476 {
 477         ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
 478
 479         /* Perform the memory read or write */
 480
 481         switch (function) {
 482         case ACPI_READ:
 483
 484                 ACPI_MEMCPY(ACPI_CAST_PTR(char, value),
 485                             ACPI_PHYSADDR_TO_PTR(address),
 486                             ACPI_DIV_8(bit_width));
 487                 break;
 488
 489         case ACPI_WRITE:
 490         default:
 491
 492                 return_ACPI_STATUS(AE_SUPPORT);
 493         }
 494
 495         return_ACPI_STATUS(AE_OK);
 496 }